My eyes widened as I opened this image and when I clicked the highres my jaw dropped a little! The impact of the hit on the bridge is just amazing! So is the perspective, angle and composition of the piece. I also like the color palette and the artistic style, reminds me a little of the older animated comics like Asterix and Obelix if you've seen it?

I read your description and don't know the reference so I'll just stick to this being mostly your own creation and then I must commend the dragon design. It looks really fierce and with the colorchoice and the design of the scales it looks like a really tough dragon, i.e. hard scaled creature. This adds to the image as the crash looks intentional, as this is something it intended to do rather as a fluke. That gives the dragon intelligence and paints a whole story almost that it is attacking the city deliberately and not just for the sake of attacking it. Very cool. The little people falling of the bridge are also a nice touch and their poses are great. I can almost hear the screams as they fall.

My main critism is the dragons right arm that has lost a bit of sharpness and saturation, which might have been intentional to push it into the background, but I think a bit too much has been lost and would have liked to have seen it be a bit sharper but perhaps with the same saturation. My second little querk is the wing up to the right which I don't quite understand how we can see the wing both infront and behind the "leg" for the lack of a better word. However, these are nitpicks as the image overall is just... striking to look at. Great wok :)